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https://issues.apache.org/jira/browse/MAHOUT-1935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15852604#comment-15852604
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ASF GitHub Bot commented on MAHOUT-1935:
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GitHub user rawkintrevo opened a pull request:
https://github.com/apache/mahout/pull/277
MAHOUT-1935 fix double calculation of XtX
Collect XtX only once, and pass it to `solve`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rawkintrevo/mahout mahout-1935
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/mahout/pull/277.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #277
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commit 470a5748e34cd085bc5e89d458aa3b136de46af4
Author: rawkintrevo <trevor.d.gr...@gmail.com>
Date: 2017-02-04T05:17:41Z
MAHOUT-1935 fix double calculation of XtX
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> Inefficient use of XtX calculation in Ordinary Least Squares
> ------------------------------------------------------------
>
> Key: MAHOUT-1935
> URL: https://issues.apache.org/jira/browse/MAHOUT-1935
> Project: Mahout
> Issue Type: Improvement
> Affects Versions: 0.13.0
> Reporter: Trevor Grant
> Priority: Minor
> Labels: beginner
> Fix For: 0.13.0
>
>
> In line 59 of OrdinaryLeastSquaresModel we calculate and collect XtX, but
> then don't bother to use it (so it is in essence calculated twice).
> https://github.com/apache/zeppelin/blob/master/spark/src/main/java/org/apache/zeppelin/spark/SparkInterpreter.java
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